Tanned or burned: The role of fire in shaping physical seed dormancy

8 páginas, 3 figuras, 3 tablas.

Detalles Bibliográficos
Autores: Moreira, Bruno, Pausas, J. G.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/62310
Acceso en línea:http://hdl.handle.net/10261/62310
Access Level:acceso abierto
Palabra clave:Dormancy
Fire
Germination
Heat shock
Mediterranean
Seed
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spelling Tanned or burned: The role of fire in shaping physical seed dormancyMoreira, BrunoPausas, J. G.DormancyFireGerminationHeat shockMediterraneanSeed8 páginas, 3 figuras, 3 tablas.Plant species with physical seed dormancy are common in mediterranean fire-prone ecosystems. Because fire breaks seed dormancy and enhances the recruitment of many species, this trait might be considered adaptive in fire-prone environments. However, to what extent the temperature thresholds that break physical seed dormancy have been shaped by fire (i.e., for post-fire recruitment) or by summer temperatures in the bare soil (i.e., for recruitment in fire-independent gaps) remains unknown. Our hypothesis is that the temperature thresholds that break physical seed dormancy have been shaped by fire and thus we predict higher dormancy lost in response to fire than in response to summer temperatures. We tested this hypothesis in six woody species with physical seed dormancy occurring in fire-prone areas across the Mediterranean Basin. Seeds from different populations of each species were subject to heat treatments simulating fire (i.e., a single high temperature peak of 100uC, 120uC or 150uC for 5 minutes) and heat treatments simulating summer (i.e., temperature fluctuations; 30 daily cycles of 3 hours at 31uC, 4 hours at 43uC, 3 hours at 33uC and 14 hours at 18uC). Fire treatments broke dormancy and stimulated germination in all populations of all species. In contrast, summer treatments had no effect over the seed dormancy for most species and only enhanced the germination in Ulex parviflorus, although less than the fire treatments. Our results suggest that in Mediterranean species with physical dormancy, the temperature thresholds necessary to trigger seed germination are better explained as a response to fire than as a response to summer temperatures. The high level of dormancy release by the heat produced by fire might enforce most recruitment to be capitalized into a single post-fire pulse when the most favorable conditions occur. This supports the important role of fire in shaping seed traits.We thank the authorities from the Parque Natural del Carrascal de la Font Roja and Fundación Caja Castellón-Bancaja (Barranc dels Horts, Ares del Maestrat) for permission to collect seeds in these areas. We also thank C¸ . Tavsanoglu for his collaboration in the seed collection and germination experiment and J. Baeza for providing soil temperature data for the Ayora site (Fig. 1).Peer reviewedPublic Library of Science201220122012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/62310reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1371/journal.pone.0051523info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/623102026-05-22T06:33:51Z
dc.title.none.fl_str_mv Tanned or burned: The role of fire in shaping physical seed dormancy
title Tanned or burned: The role of fire in shaping physical seed dormancy
spellingShingle Tanned or burned: The role of fire in shaping physical seed dormancy
Moreira, Bruno
Dormancy
Fire
Germination
Heat shock
Mediterranean
Seed
title_short Tanned or burned: The role of fire in shaping physical seed dormancy
title_full Tanned or burned: The role of fire in shaping physical seed dormancy
title_fullStr Tanned or burned: The role of fire in shaping physical seed dormancy
title_full_unstemmed Tanned or burned: The role of fire in shaping physical seed dormancy
title_sort Tanned or burned: The role of fire in shaping physical seed dormancy
dc.creator.none.fl_str_mv Moreira, Bruno
Pausas, J. G.
author Moreira, Bruno
author_facet Moreira, Bruno
Pausas, J. G.
author_role author
author2 Pausas, J. G.
author2_role author
dc.subject.none.fl_str_mv Dormancy
Fire
Germination
Heat shock
Mediterranean
Seed
topic Dormancy
Fire
Germination
Heat shock
Mediterranean
Seed
description 8 páginas, 3 figuras, 3 tablas.
publishDate 2012
dc.date.none.fl_str_mv 2012
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
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info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/62310
url http://hdl.handle.net/10261/62310
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1371/journal.pone.0051523
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Public Library of Science
publisher.none.fl_str_mv Public Library of Science
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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score 15,81155

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